Quest Diagnostics Incorporated
US ˙ NYSE ˙ US74834L1008

SecurityDGX / Quest Diagnostics Incorporated
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership16,666 shares
Latest Disclosed Value $ 3,267,298
Advisor Group Holdings, Inc. reports 15.01% decrease in ownership of DGX / Quest Diagnostics Incorporated

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 16,666 shares of Quest Diagnostics Incorporated (US:DGX) valued at $3,266,203 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 19,609 shares of Quest Diagnostics Incorporated. This represents a change in shares of -15.01% during the quarter. The current value of the position is $3,338,033 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F QUEST DIAGNOSTICS COM 74834L100 16,666 -2,943 -15.01 3,267 -4.02 0.0028
2026-02-17 2025-12-31 13F QUEST DIAGNOSTICS COM 74834L100 19,609 -4,789 -19.63 3,405 -24.42 0.0050
2025-11-14 2025-09-30 13F QUEST DIAGNOSTICS COM 74834L100 24,398 999 4.27 4,505 7.21 0.0063
2025-09-04 2025-06-30 13F/A-1 UEST DIAGNOSTICS COM 74834L100 23,399 365 1.58 4,201 7.75 0.0075
2025-08-13 2025-06-30 13F UEST DIAGNOSTICS COM 74834L100 11,117 -11,917 1,745 0.0020
2025-05-12 2025-03-31 13F QUEST DIAGNOSTICS COM 74834L100 23,034 7,715 50.36 3,900 100.15 0.0087
2025-06-06 2024-12-31 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 15,319 -15,968 -51.04 1,948 -59.90 0.0044
2025-02-07 2024-12-31 13F QUEST DIAGNOSTICS COM 74834L100 15,333 -15,954 1,988 0.0051
2024-11-13 2024-09-30 13F QUEST DIAGNOSTICS COM 74834L100 31,287 12,168 63.64 4,858 85.63 0.0110
2024-08-13 2024-06-30 13F QUEST DIAGNOSTICS COM 74834L100 19,119 -4,885 -20.35 2,618 -18.09 0.0062
2024-05-10 2024-03-31 13F QUEST DIAGNOSTICS COM 74834L100 24,004 -10,260 -29.94 3,196 -32.38 0.0071
2024-02-12 2023-12-31 13F QUEST DIAGNOSTICS COM 74834L100 34,264 -4,010 -10.48 4,725 1.26 0.0083
2023-11-13 2023-09-30 13F QUEST DIAGNOSTICS COM 74834L100 38,274 4,988 14.99 4,666 -0.32 0.0069
2023-08-21 2023-06-30 13F/A-1 QUEST DIAGNOSTICS COM 74834L100 33,286 -11,529 -25.73 4,682 -26.28 0.0084
2023-08-10 2023-06-30 13F QUEST DIAGNOSTICS COM 74834L100 92,180 47,365 4,623 0.0013
2023-05-12 2023-03-31 13F QUEST DIAGNOSTICS COM 74834L100 44,815 17 0.04 6,350 -9.47 0.0119
2023-02-10 2022-12-31 13F QUEST DIAGNOSTICS COM 74834L100 44,798 796 1.81 7,014 29.86 0.0142
2022-11-14 2022-09-30 13F QUEST DIAGNOSTICS COM 74834L100 44,002 30 0.07 5,401 -7.82 0.0123
2022-08-10 2022-06-30 13F QUEST DIAGNOSTICS COM 74834L100 43,972 7,478 20.49 5,859 29.22 0.0129
2022-05-04 2022-03-31 13F QUEST DIAGNOSTICS COM 74834L100 36,494 -12,318 -25.24 4,534 -46.24 0.0088
2022-02-03 2021-12-31 13F QUEST DIAGNOSTICS COM 74834L100 48,812 16,611 51.59 8,434 80.33 0.0160
2021-11-05 2021-09-30 13F QUEST DIAGNOSTICS COM 74834L100 32,201 1,969 6.51 4,677 16.81 0.0097
2021-08-02 2021-06-30 13F QUEST DIAGNOSTICS COM 74834L100 30,232 -10,239 -25.30 4,004 -22.96 0.0087
2021-05-13 2021-03-31 13F QUEST DIAGNOSTICS COM 74834L100 40,471 1,261 3.22 5,197 11.26 0.0125
2021-02-10 2020-12-31 13F QUEST DIAGNOSTICS COM 74834L100 39,210 1,473 3.90 4,671 8.10 0.0125
2020-11-12 2020-09-30 13F QUEST DIAGNOSTICS COM 74834L100 37,737 -6,579 -14.85 4,321 -14.45 0.0129
2020-08-14 2020-06-30 13F QUEST DIAGNOSTICS COM 74834L100 44,316 2,397 5.72 5,051 130.64 0.0170
2020-05-18 2020-03-31 13F QUEST DIAGNOSTICS COM 74834L100 41,919 41,919 2,190 0.0090
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.